近几年来,斑点落叶病已成为大连地区苹果树上的重要防治对象,其中元帅系和印度等主裁品种受害尤为严重。以往当地在生长季防治苹果树的叶、果病害主要是喷洒波尔多液。但是,该药剂对斑点落叶病的防治效果甚差,往往在生产上造成大量提早落叶,严重影响当年的产量和花芽形成,削弱树势,降低树体抗病能力。 In recent years, speckle deciduous disease has become an important control object on the apple tree in Dalian, of which mandarin and India and other referees breed victims is particularly serious. Past local prevention and control of apple tree leaves in the growing season, the main disease is spraying Bordeaux mixture. However, the medicament has a very poor control effect on spotted leaf decay, and often causes a lot of early deciduous leaves in production, seriously affecting the yield and flower bud formation of that year, weakening the tree vigor and reducing the tree disease resistance.